if you do it with oil warm it will be a few minutes. On cold oil it can take sometimes twice as long. If you like to also do a quick replacement of powersteering fluid reservoir you can work that in too. Suck up powersteering reservoir. Then start sucking the engine oil. Fill powersteering reservoir, replace oil filter, and by that time you should be ready to finish or check on your oil extraction/reposition the tube and get the last bits it can reach out.
As far as the old oil argument, some drains are also not positioned where all the oil drains out so sometimes extractors get more. So you are OCDing over nothing. You're never getting all the oil out of your car unless you're doing flushes and double oil changes each time. If you're the type that is scared of the "old oil", that begs the question of the massive damage the bad oil was doing to your vehicles the lst miles prior to your change. The oil doesn't suddenly turn bad just at the moment you begin your oil change.
At least on my cars, after extraction, to refill to full takes specced fluid capacity.